PLATE CVI. 



Fig. 

 1. Upper curved bristle of the fourth foot of Pygospio elegans, Claparede. x oc. 4, obj.F. 

 1 a. Upper capillary bristle of the foregoing with a very slight wing. X oc. 2, obj. D. 

 1 b. Winged bristle in lateral view, from Whitecliffe Bay, Isle of Wight. X oc. 4, obj. C. 

 1 c. Winged bristle of the fourth foot seen antero-posteriorly. x oc. 4, obj. F. 

 1 d. Hook of the same, from Whitecliffe Bay. X oc. 4, obj. C. 



1 e. Hook from the ninetieth foot. X oc. 4, obj. F. 



2 and 2 a. Front and lateral views of the capillary bristles of Polydora ciliata, Johnston. 



x oc. 4, obj. D. 

 2 b and 2 c. Different view of the great hooks of the fifth segment of the same species. 

 X 350 diam. 



2 d. Hook of the foregoing, x 350 diam. 



3. Front view of one of the shorter capillary bristles of Polydora flava, Claparede. X 



oc. 4, obj. D. 



3 a. Lateral view of one of the longer bristles with narrow wings. X oc. 4, obj. D. 

 3 b. Great hook of the fifth segment. X oc. 4, obj. D. 



3 c. Typical ventral hook, x oc. 4, obj. D. 



4. Dorsal bristle, with narrow wings, of Polydora qimdrilobata, Jacobi, var. Mesnili. 



X oc. 4, obj. D. 



4 a. Bristle of the fifth foot, x oc. 4, obj. D. 



4 b. Great hook of the fifth segment of the same. X oc. 4, obj. D. 



4 c. Ventral hook of the same species. X oc. 4, obj. D. 



5. Winged dorsal bristle of Polydora Oaulleryi, MesniL x oc. 4, obj. F. 



5 a. Bristle of the same species with broader tip and marked curve backward. X oc. 4, 



obj. F. 

 5 b and be. Great hooks from the fifth segment. x oc. 4, obj. D. 



5 d and 5 d'. Ventral hooks of the foregoing from Lochmaddy. X oc. 4, obj. F, with 



draw-tube. 



6. Dorsal bristle of Polydora hoplura, Claparede, with narrow wings. X oc. 4, obj. F. 



6 a and 6 b. Tips of two of the great hooks of the fifth segment viewed differently, 



Lochmaddy, North Uist. X oc. 4, obj. F. 



6 c. Ventral hook of the foregoing. X oc. 4, obj. F. 



7. Inferior bristle, with slight wings from the anterior region of Magelona papillicornis, 



F. Muller. x 350. 



7 a. Upper bristle of the same region. x 350. 



7 b, 7 c, 7 d, 7 e. Various bristles of the ninth segment of the same species. The enlarged 



tip appears to be a modification of the wing which is present in all. X 350. 

 7 f. Lateral view of a hook in a spirit-specimen. X 350. 

 7 g. Another view of a hook showing several points. X 350. 



7 h. Hook from a living specimen. X 350. 



8. Anterior dorsal capillary tuft of Spio B. X 200. 



8 a. Posterior ventral bristle of the same, x 360. 



9. Ventral dotted bristle of Spiophanes bombyx, Claparede. x 360. 

 10. Dorsal tuft of bristles from the middle of Spio G. X 200. 



